Sock



FIG. 1 is a perspective view of a sock, showing my new design while in use;

FIG. 2 is a bottom view;

FIG. 3 is a left side view;

FIG. 4 is a back view;

FIG. 5 is a top view;

FIG. 6 is a front; and,

FIG. 7 is a right side view thereof.

The broken lines are included for the purpose of showing environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a sock, as shown and described. 